Window Shopping on your phone.
Is having an app which provides window shopping on your phone a good idea?
Idea is good but execution will be a difficult one. What you application will do? By window shoping do you mean people can check the prodcuts but not buy, or check and buy.
Flipkart, Amazon or Myntra among other E-Commerce apps are already established and you can do window shopping on them.
If you wish to launch an app keeping affilliate earnings in mind, already there are many. But you can launch with different product offerings.